Table of Contents
What does return None do in Python?
In Python, every function returns something. If there are no return statements, then it returns None. If the return statement contains an expression, it’s evaluated first and then the value is returned.
What does None mean in Python?
null value
None is used to define a null value. It is not the same as an empty string, False, or a zero. It is a data type of the class NoneType object. Assigning a value of None to a variable is one way to reset it to its original, empty state.
What does the return value mean in Python?
The Python return keyword exits a function and instructs Python to continue executing the main program. The return keyword can send a value back to the main program. A value could be a string, a tuple, or any other object.
What does it mean to return nothing?
Using return None This tells that the function is indeed meant to return a value for later use, and in this case it returns None . This value None can then be used elsewhere. return None is never used if there are no other possible return values from the function.
Why does my program return None?
The function returns None when the denominator is 0. This makes sense as the result is undefined so sending None sounds natural. However, the user of the function can incorrectly use it as shown below. When the numerator is 0, the function would return 0, which is expected but look at what happens in the if statement.
Why is IF statement returning None?
Sounds like you’re printing the return result of the function. If the function returns None, then that’s what’s gonna print. If you don’t want this to happen, then save the result in a variable and compare it to None before deciding whether to print it.
What is called the functions with no return value?
Correct Option: A Void functions does not return a value. Functions with no return value are sometimes called procedures.
Why does Python print return none?
The print () function returns None. You are printing that return value. That’s because print () has nothing to return; its job is to write the arguments, after converting them to strings, to a file object (which defaults to sys.stdout ). But all expressions in Python (including calls) produce a value, so in such cases None is produced.
How to return a function Python?
To let a function return a value, use the return statement: function definitions cannot be empty, but if you for some reason have a function definition with no content, put in the pass statement to avoid getting an error. Python also accepts function recursion, which means a defined function can call itself.
How does a return work in Python?
The Python return Statement: Usage and Best Practices Getting Started With Python Functions. Understanding the Python return Statement. Returning vs Printing. Returning Multiple Values. Using the Python return Statement: Best Practices. Returning Functions: Closures. Taking and Returning Functions: Decorators. Returning User-Defined Objects: The Factory Pattern. Using return in try finally Blocks.
How to use return in Python?
Python return. The return is a built-in Python statement or keyword used to end the execution of a function call and “returns” the result (value of the expression following the